Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd07cbe9ca34fba…

MALICIOUS

PDF

73.8 KB Created: 2021-06-13 18:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1f8c55b688c4f855451447004805e5c7 SHA-1: 421c273523554445b7de95b70787d1f4a5c18262 SHA-256: 8dd07cbe9ca34fbad9511dc4bcd6072beb3fa1af0bacdcffa5526d412eff4261
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=fh4+rare+auction+cars PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/vha51h52k39n0nq3vnvh9albf3/84487561609.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4553e8feda---kasadexivonun.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4de70861---fivuwomabemuse.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9930544b---tejala.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bc475b53---modibagufevixumari.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/11b61c739ee86d2dc3a8d955e784df12/83707925916.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/losebejijez.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ganig2e3t6n501jh3ev4g6ri42/janojumal.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile/%5C/jomonisuxojolinenutapibu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7249c6efcfaf4063940045a91e389046/42038343078.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/37775524351.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/29956405396.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmq9kclb5q53o6cccqtdol25n7/ragokuzepakegudup.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ac8795cb7877b327ed8c539bd76080c0/31719245008.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7a6ad8db381e0eafcdcb607e0150e9b9/butofamozuzavomimoratofo.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527210725.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/ropovole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 4900 bytes
SHA-256: 6d42fac6cfa49fbc29b6c134ccdbb55573edce00b4b24b8d38a846e27891c6e7
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10640 bytes
SHA-256: 8a3f3dbebece4273c46201e03a7ce4a023ed9f0018dfe3fbbc16ff2075b661af